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All Need to Know About Atoms. Element. A substance made from only one type of atom Cannot be broken down chemically into a simpler substance. Atom. The smallest unit of an element that has the chemical properties of that element. Protons and Electrons.
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Element • A substance made from only one type of atom • Cannot be broken down chemically into a simpler substance
Atom • The smallest unit of an element that has the chemical properties of that element
Protons and Electrons • Proton- subatomic particle with a positive charge • Electron- subatomic particle with a negative charge
Periodic Table • A table that organizes elements by their properties
Atomic Number and Mass Number • Atomic Number- Number of Protons • Mass Number- Number of Protons + Number of Neutrons Element Symbol Name of element Mass Number
Fill in Electron Shells 2/8/8/2 • Boron